I am 21 years old and about 3 days ago I started having pain on the very top of the buttcrack. I found a lump on end of my tailbone on the top of the buttcrack. It is under the skin. Not red or draining any fluids. I know it's not a pilonidal cyst. It doesnt move. It's hard and keeps getting bigger. I can hardly sit, lay down, or even walk without pain. It hurts to touch it. I can hardly stand it. I have not fallen or done anything to cause this. It is very confusing. It's scaring me. Any information you might have would be a big help!